<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
        .clearfux::after{
            content: "";
            display: block;
            clear: both;
        }

        .container{
            width: 500px;
            height: auto;
            margin: 5px auto;
            border: 2px solid #f3f3f3;
            background-color: azure;
        }

        .two-column{
            width: 490px;
            height: 100px;
            margin: 5px;
            border: 1px solid red;
        }

        .two-colum-left{
            float: left;
            width: 300px;
            height: 90px;
            margin: 5px;
            background-color: red;
        }

        .two-colum-right{
            float: left;
            width: 175px;
            height: 90px;
            margin: 5px 5px 5px 0;
            background-color: yellow;
        }

        .three-column{
            width: calc(100% - 10px);
            height: 100px;
            margin: 5px;
            border: 1px solid blue;
        }

        .three-colum-left{
            float: left;
            width: 170px;
            height: 90px;
            margin: 5px;
            background-color: blue;
        }

        .three-colum-center{
            width: calc(100% - 360px);
            height: 90px;
            margin: 5px 0px;
            float: left;
            background-color: orangered;
        }

        .three-colum-right{
            float: left;
            width: 170px;
            height: 90px;
            margin: 5px;
            background-color: purple;
        }

        .item-list{
            width: 490px;
            height: 220px;
            margin: 5px;
            border: 1px solid green;
        }

        .item{
            width: 88px;
            height: 100px;
            margin: 5px;
            background-color: aquamarine;
            float: left;
        }

    </style>
  </head>
  <body>
    <div class="container">
      <div class="two-column clearfix">
        <div class="two-colum-left"></div>
        <div class="two-colum-right"></div>
      </div>
      <div class="three-column clearfix">
        <div class="three-colum-left"></div>
        <div class="three-colum-center"></div>
        <div class="three-colum-right"></div>
      </div>
      <div class="item-list clearfix">
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
        <div class="item"></div>
      </div>
    </div>
  </body>
</html>
